Added improvements found in revision 1.3 of raytracer.mlton-2.mlton.
Added improvements found in revision 1.3 of raytracer.mlton-2.mlton.

kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout,kragen/shootout